1617152477561 has 4 divisors (see below), whose sum is σ = 1617286437492. Its totient is φ = 1617018517632.

The previous prime is 1617152477539. The next prime is 1617152477587. The reversal of 1617152477561 is 1657742517161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35846227561 + 1581306250000 = 189331^2 + 1257500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1617152477561 - 2⁶ = 1617152477497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1617152477861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66961856 + ... + 66986001.

It is an arithmetic number, because the mean of its divisors is an integer number (404321609373).

Almost surely, 2^{1617152477561} is an apocalyptic number.

It is an amenable number.

1617152477561 is a deficient number, since it is larger than the sum of its proper divisors (133959931).

1617152477561 is a wasteful number, since it uses less digits than its factorization.

1617152477561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133959930.

The product of its digits is 2469600, while the sum is 53.

The spelling of 1617152477561 in words is "one trillion, six hundred seventeen billion, one hundred fifty-two million, four hundred seventy-seven thousand, five hundred sixty-one".